EF DPFI idles high, and then higher, any advice?

x357rq · Post by **x357rq** » Wed Aug 11, 2010 9:28 pm

I guess I'm gonna have to pull off the throttle body to figure this one out...it idles high and then if I give it gas it sticks even higher. If i push on the throttle body near where the throttle cable attaches and lift up I can see that this closes the butterfly more and then it idles nice and quiet. Tried lubing it and that didn't help...disconnected the throttle cable so I know that is not the problem.

There is an arm connecting the throttle linkage to a vacuum controlled diaphragm...I'm assuming that this is a type of Idle control device? When I force the butterfly closed it seems to be fighting this thing a bit...is there a way to test this?

It's a 91 civic hatch 1.5 i think this is the d15b7? But I don't know my 1.5 engine codes, oops. it's a DX civic.

I tried looking on hondahookup for a manual but it seems they only have dpfi manuals

x357rq · Post by **x357rq** » Wed Aug 11, 2010 10:19 pm

ok it's not the idle controller thing, or the idle adjust screw, it's simply just not jamming up in return...probably internal...shit.

rickles8099 · Post by **rickles8099** » Wed Aug 11, 2010 10:22 pm

check for vacuum leaks.

x357rq · Post by **x357rq** » Wed Aug 11, 2010 11:07 pm

you know vacuum was my first thought, but if you just tug the TB closed then it idles as quiet and low as can be...but then again I might be closing the TB farther than normal to compensate for vacuum leak, perhaps I will do a more thorough hose check. This car sat for about 4 years.

x357rq · Post by **x357rq** » Thu Aug 12, 2010 1:16 am

it was the return spring...i just twisted it extra and lodged the end in a place that was not it's original home lol. it solved the problem. my project now successfully runs, stops, and looks like ass.

Lynxs1981 · Post by **Lynxs1981** » Thu Aug 12, 2010 1:27 pm

You might have some gunk around the butterfly then. I'd check around the edges and where the shaft exits the TB.